Sierra Club Wilderness Wall Calendar: With nearly 10 million copies sold, the Sierra Club 2013 Wall Calendar is a perennial favorite. The 2013 edition is, as always, the definitive one of its type, with dramatic and awe inspiring color photographs of wild places all across the country, taken by world renowned nature photographers. A portion of the proceeds from the sale of this calendar goes to support the efforts of the Sierra Club to preserve and protect our environment. EAN: 9780307887108